Biology 11 by Don Galbraith

It has been said that we are made of the stuff of stars. What do you think this means? The pine wood cells pictured on the right and all other organisms on Earth are made mostly of only six common chemical elements. These elements originated under the conditions of massive gravity and heat found in stars. Evidence that the molecules of life — compounds containing carbon, hydrogen, and oxygen — exist throughout the universe is found in comets like Hale-Bopp, shown below. Scientists have recently found that such rocks, travelling through space, transport compounds and molecules that form the basis of life on Earth.